Overlapping sample: t test with partial pairing??

JAaron

New Member
Hi -

I've a work project that requires a stat test between Product A and Produce B performance ratings (On a scale of 1 to 5 how well did Product A / B perform?)

We are treating the data as interval scaled.

The samples partially overlap. e.g. Product A has n=500; Product B has n=500; there are 250 common respondents between the two.

What test is appropriate here?

I dug around and the only detailed reference I could find that seemed to fit the bill is here on page 20. Dependent t-test with partial pairing. Is that what I need?
http://www.analyticalgroup.com/statistical_reference14/Statistical Reference.pdf

Thank you!

Jake

A mixed model / multilevel model / hierarchical linear model / random effects model (this same model goes by many different names, as you can see) can easily handle this.

CB

Super Moderator
Jake, just out of interest, can I check how you would specify the mixed model? I'm thinking something just like:

Code:
lme(Performance ~ Product, random = ~1 | Respondent)